Gain
Calibration:
Due to the fact that no negative feedback is used in the audio circuitry, the actual gain is
dependent of the state of tubes, therefore the 0dB gain level can be adjusted. Apply a 1kHz
test tone at 0db level at the main input and adjust the AC calibration for 0dB gain on the
output. The range is -3dB to +3dB in 0.5dB steps.
Reduction
Calibration:
To calibrate the gain reduction meter, apply a 1kHz test tone at 0db level at the main input
and adjust the threshold control until the output Level is -10dB. Then modify the Reduction
Calibration until the gain reduction meter reads 10 dB.
Main Menu:
Push main menu to get back to the root menu.
Quick Access Buttons:
Independent which part of the menu system is active at the moment, the three quick access
buttons allow immediate control of the main operating parameters.
GAIN:
Changes the input gain in exactly the same way as through the menu system, the secondary
function, if the control is pushed, is toggling the
BYPASS
function.
Threshold:
Changes the threshold in exactly the same way as through the menu system, the secondary
function, if the control is pushed, is toggling the
Side Chain
function.
Release:
Changes the input gain in exactly the same way as through the menu system, the secondary
function, if the control is pushed, is toggling the
LINK
function.
Fredenstein F660A Manual Release 1.0 Oct 17, 2014 Page 7